Burgess made the '80 second' quote - and you're misrepresenting it. He didn't say that he could fix the Duke in 80 seconds. He was discussing the set-up woes of the 'lesser riders on the Ducati', who set up their suspension too softly, in his view.
Rossi did say Stoner "wasn't trying hard enough" on the 2010 Ducati, independent of any statement by Burgess, which some might consider makes his assessment of how hard MM might have been trying on the current Honda which he also has never ridden not necessarily totally reliable.